Method and apparatus for coupling facsimile signals to a telepho

Details Method and apparatus for coupling facsimile signals to a telepho Method and apparatus for coupling facsimile signals to a telepho

1977-10-21

1978-12-19

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358284, 328 30, 178 66R, H04H 140

Patent

active

041308409

ABSTRACT:
A frequency modulated facsimile signal is synthesized from a high frequency signal having a frequency which varies in response to dark/light variations on a document. The higher frequency signal which comprises pulses is coupled to a synthesizing network which includes a digital-to-analog converter for producing synthesized frequency modulated facsimile signals. Enabling circuitry is associated with the digital-to-analog converter which assures that the frequency modulated facsimile signal will not terminate or begin except at axis crossing times.

REFERENCES:
patent: 3824498 (1974-07-01), McBride
patent: 3920897 (1975-11-01), Grant et al.
patent: 3991389 (1976-11-01), Dwire et al.
patent: 4003002 (1977-01-01), Snijders et al.

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